Building corner unit



Dec. 7, 1937. R. s. M LEAN BUILDING CORNER UNIT Fild' April 24, 1936 2 She ets-She'et 1 I INVENTOR. -v

Dec. 7, 1937. R. Q MaCLEAN 2,101,589 v l BUI'LDING CORNER UNIT 1 Filed April 24, 1936 I 2 Sheets-Sheet 2 ///////7//3Z i/////////////i' INVENTOR.

Patented Dec. 7, 1937 UNITED STATES PATENT orrlce 2,1o1,5s9 BUILDING CORNER m Robert S.'-Maclean, Michigan City, 1nd,, assignor to Mastic Asphalt Corporation, a corporation of Indiana Application "April 24, 19ao,fsen'a1 No. 16,212

4 Claims. (Cl. 20-5) My invention relates to building covering materials and the like, and more particularly to cornerunits adapted to be utilized in connection with rigid or flexible building covering units of the type now in common use.

My invention relates specifically to a rigid corner unit capable of attachment to the structure of a building and may have portions which extend from the comer parallel to the meeting walls to cover the edges of the sidingunits. v

One of the objectsof my invention is to pro vide a corner unit that will be weatherproof and fire-resisting, as well as being exceptionally attractive due:to the many designs and c'onfi'gura-' tions which may be impressed thereon, without detracting in any-manner from the wearing qualities thereof.

Another object of my invention is to provide a an improved corner unit of the type described that may be cheaply manufactured, be rugged in construction and be capable of long use and abuse without deteriorating from the appearance thereof.

A further objectis to provide arigid corner unit of the type described that will give the appearance of outset corner units upon the building. 1

Afurthr object is to. provide a corner unit;

-of the type described that will have the appearance of brick corner construction and be capable [of use in aligning and applying siding units.

A further object is to provide a corner unit capable of attachmentto the building structure by concealed fastening means. v

A further object of my invention is to provide a new process of manufacturing corner units of the type described, wherein by the steps taken the unit is reinforced so that it will withstand hard abuse and be more rigid when applied than m the ordinary. flat siding units.

A further object is to provide a process easily and. simply carried out by ordinary unskilled workmen. I c 7 Other objects and advantages will be more 45 apparent from the following description wherein reference ishad to the accompanying two sheets of drawings, upon which Fig. 1 is a perspective view of a sheet of in-' sula ting board showing a reinforcement that is i 50 laid upon the face thereof during one step of my improved process;

Fig. 21s a similar view of the same board after it has been treated with a coating-of asphalt and grits; 55 Fig. 3 is a similar perspective view of the board turned upside down showing another step in the proces s'of forming the corner unit;

Fig. 4 is a fragmentary cross sectional view taken onthe line 4-4 'of Fig.- 3;

Fig. 5 is a perspective view showing a further 5 step in the process of forming the corner unit; .Fig. 6 is a front perspective view of the complete. .cornerf unit;

Fig. 7 is a vertical cross sectional view taken generally on the line 1-1 of Fig. 6; and 10 Fig. 8 is a side perspective view of a modified form of corner unit constructed by the same process. n

The corner units which are manufactured by -'the process I am about to describe, are con- 15 structed of ordinaryfiat I rectangular strips of insulating board such as are well known in-the art. These boards are not ordinarily used as exterior building covering for the reason that they are not water-proof or weather-proof. However, by a process. which is described in the co-pending application of Robert S. Maclean and Charles I W. Pollard, Serial No. 753,472, filed Nov. 1'7, 1934,

such insulating boards are submitted to a process whereby a surface thereof is treated with as- ,25 phalt and grits so that when 'a plurality 'of the covering units are placed upon theside 'of a building, a water-proof and weather-proof siding is provided. l

Accordingly, in constructing the corner units which I provide, I utilize a. rectangular sheet in of insulating board such *as previously described, which is provided in suitable sizes and also provided with a pair of ship-lap edges l2 and for a purpose which will be hereinafter exmentioned, and treated to receive a layer of hot asphalt 22 and a layer of grits 24 upon the face ll thereof.

In the illustration shown in Fig. 2 I have also shown a plurality of longitudinal mortar lines 26 and of transverse mortar lines 28, so that the board when covered resembles a section of a brick wall. It 'will be noted that the weatherproofing has been applied over the sisal stripsv It so that in addition to being secured to the board originally by the thin layer of asphalt, they are now completely covered by the asphalt and grits which form the weather-proof surface of the unit.

The next step in my improved process is to turn the unit over on its face and with a suitable 'V-shaped router or other means, cut a cross groove 30 in the back side 29 of the board medially between the edges of the first treated portion it. The groove 30 may be cut toa depth adjacent the exterior edge of the original board Ill and be smoothed out and finished with an emery wheel if desired.

After this has been done, the unit III is ready to be bent to the right angle shape shown in Fig. 5, forming a corner portion having the long extension 32 and the shorter extension 34. When the board has been turned as described, a quantity of. hot asphalt is applied to the shaded area 36 on the back side 29 of the unit and a reinforcing member 38 is applied thereto, being adhered by the asphalt or other means which has adhesive qualities. The reinforcing II is preferably saturated felt or paper, although it (will be understood that cloth, metal, wire mesh or any other suitable'reinforcing medium may be employed.

After the corner unit has been formed as shown in Fi 5, due to the bending to complete the previously described operation, there will be more or less of a cracking of the cooled asphalt on the exterior face along the vertical bend line It is next necessary to apply heat, for example with a blow torchyalong this entire edge. melt the I asphalt to a certain degree and then apply a quantity of grits along this edge, rolling the'same into the asphalt as it is melted and thereby completely sealing up and welding any and all cracks which mayhave formed during the bending process. It is also necessary at this time to apply a heated tool such as a bar to the longitudinal mortar lines 26 to secure at the corner the same identical depression or groove that is formed throughout the length of the units.

By the process I have explained, it 'will be obvious that .an extremely rigid corner unit has been 'provided, one thatis actually strengthened by this process to the extent that rough handlingor'lo'ng use will not have any effect upon the appearance of thesame nor upon the rigidity with which it holds its position. Due to the steps of the process whereby after the bend has been made, the asphalt at the bend which as been sub- 'jected to a strain is again reheated and reworked and new grits applied, it will be obvious that this step will materially aid in the preserving of the rigidity and in giving the appearance-of a unit formed in its inception as a bent member;

In actual use the, units are applied in connection with the siding units previously mentioned with the-ship-lap edges matching with those of I the adjacent ts, enabling each unit to be nailed in position on the buildlngbefore the next adjacent unit is placed over the ship-lap edges.

In Fig. 8 I have illustrated a modified form of corner unit constructed in the manner that I have described but which in addition to the steps described is coated upon its exposed edges 52 and 5 with a coating of asphalt and grits so that the samev can be applied over either flexible same can be applied to a building and overlap adjacent lower units. This type of building corner unit has been found to be very attractive in that it gives an offset corner edge and has been found very. practical in that as previously mentioned, itis not necessary to attempt to match up the siding units with the corner unit as is necessary using the units shown in Fig. 6.

While 1 have illustrated and described a specific embodiment of my invention and the preferred process of manufacturing the same, it will be obvious to those skilled in the art that changes and modifications may be made both as to the specific details in the corner unit and in the particular process which has been described. I do not wish to be limited in any material way to the exact details shown; rather what I desire to secure and.

of the United States is:

bent to the desired angle and reinforced both up- 4 on its back side and upon its front side under said layer and adjacent the bend.

' .2.-A rigid corner unit of the type described constructed of a fiat composition board, said board'having a fiber reinforcement placed over an area upon its outer side, asphalt and grits covering said outer side and reinforcement, said board cut for the major portion of its thickness upon its back side and bent to a desired angle and a reinforcing member applied to said corner upon the inside of said board.

3.-A rigid corner unit of the type described constructed of a rigid bent composition board covered upon its outer surface with a continuous layer of weather resistant material and a flexible reinforcing memberunderlying said material at said bend. a

4. A rigid corner unit of the type described constructed from a rigid bent composition board, weather-proof material; coating the exterior surface of said board, reinforcing means adhering to the inside and outside of said board at said bend. said material covering said outer reinforc ROBERT 8. MACLEAN. 

